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Great looking watch you've got there, I am not a watchmaker so please understand my opinion a is just that. I cannot see anything that stands out as missing. The watch seems to run OK, does like fine, to my untrained eye. What are you expexting to see that is not there?
Have you compaired it with ranfft pictures for lemania? What it tell time? Does start stop reset work?

So, your movement is not the 27CH (which is just a size (in mm approx) and the fact that it is a CHronograph). Yours has a 12 hr register, so would be a 27 CH12.
But, I believe yours is the next step, the 2310. Your best bet for spares is to find the Omega and Tissot calibre equivalents, and the part numbers from the exploded diagrams available online (there are many).
Good luck
D